Question: Write regular expressions for the following languages. Please do not build a finite automation and then convert it. That is indirect solution and wont get

Write regular expressions for the following languages. Please do not build a finite automation and then convert it. That is indirect solution and wont get points

1.1. The set of strings over alphabet {a,b,c} containing at least one a and at most one b

1.2. The set of strings over alphabet {a,b,c} containing at least one a or at most two bs

1.3. The set of binary strings not containing 111 as substring

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